body {
  background-color: #16161D;
  margin: 0;
  padding: 0;
  display: flex;
  height: 100vh;

  /* This centers our sketch horizontally. */
  justify-content: center;

  /* This centers our sketch vertically. */
  align-items: center;

  /* leave it to hide the scrollbars */
  overflow: hidden;
}